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Y-Chromosome DNA - Zalewski Family Genealogy Wiki

Y-Chromosome DNA


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====Understanding test results====
 
====Understanding test results====
 
A Y-DNA test will look at between 10 and 43 markers on the Y chromosome.  The results will tell how many repeats the test subject had at any given marker; the variations of repeats are known as alleles.  For example, at DYS455, the results will show 8, 9, 10, 11 or 12 repeats ([http://ybase.org/statistics.asp source]).  The test results are then compared to another person's results to determine the time frame in which the two people shared a [[most recent common ancestor]] (MRCA).  If the two tests match on 37 markers, there is a 50% probability that the MRCA was less than 5 generations ago and a 90% probability that the MRCA was less than 17 generations ago.
 
A Y-DNA test will look at between 10 and 43 markers on the Y chromosome.  The results will tell how many repeats the test subject had at any given marker; the variations of repeats are known as alleles.  For example, at DYS455, the results will show 8, 9, 10, 11 or 12 repeats ([http://ybase.org/statistics.asp source]).  The test results are then compared to another person's results to determine the time frame in which the two people shared a [[most recent common ancestor]] (MRCA).  If the two tests match on 37 markers, there is a 50% probability that the MRCA was less than 5 generations ago and a 90% probability that the MRCA was less than 17 generations ago.
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[[Category:Genetic Genealogy]]

Latest revision as of 15:50, 2 March 2006

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